Unverified Commit 66399567 authored by Tommaso Tocci's avatar Tommaso Tocci
Browse files

intercept readlinkat

parent 373e88de

include/client/hooks.hpp

+1 −0
Original line number Diff line number Diff line
@@ -46,6 +46,7 @@ int hook_fchmod(unsigned int dirfd, mode_t mode); 
int hook_chdir(const char* path);

int hook_fchdir(unsigned int fd);

int hook_getcwd(char * buf, unsigned long size);

int hook_readlinkat(int dirfd, const char * cpath, char * buf, int bufsiz);

int hook_fcntl(unsigned int fd, unsigned int cmd, unsigned long arg);

src/client/hooks.cpp

+26 −0
Original line number Diff line number Diff line
@@ -449,6 +449,32 @@ int hook_getcwd(char * buf, unsigned long size) { 
    return (CTX->cwd().size() + 1);

}



int hook_readlinkat(int dirfd, const char * cpath, char * buf, int bufsiz) {

    CTX->log()->trace("{}() called with path '{}' dirfd {}, bufsize {}",

                      __func__, cpath, dirfd, bufsiz);



    std::string resolved;

    auto rstatus = CTX->relativize_fd_path(dirfd, cpath, resolved, false);

    switch(rstatus) {

        case RelativizeStatus::fd_unknown:

            return syscall_no_intercept(SYS_readlinkat, dirfd, cpath, buf, bufsiz);



        case RelativizeStatus::external:

            return syscall_no_intercept(SYS_readlinkat, dirfd, resolved.c_str(), buf, bufsiz);



        case RelativizeStatus::fd_not_a_dir:

            return -ENOTDIR;



        case RelativizeStatus::internal:

            CTX->log()->warn("{}() not supported", __func__);

            return -ENOTSUP;



        default:

            CTX->log()->error("{}() relativize status unknown: {}", __func__);

            return -EINVAL;

    }

}



int hook_fcntl(unsigned int fd, unsigned int cmd, unsigned long arg) {

    CTX->log()->trace("{}() called with fd {}, cmd {}, arg {}", __func__, fd, cmd, arg);

    if (!CTX->file_map()->exist(fd)) {

src/client/intercept.cpp

+14 −0
Original line number Diff line number Diff line
@@ -217,6 +217,20 @@ static inline int hook(long syscall_number, 
                               static_cast<unsigned long>(arg1));

        break;



    case SYS_readlink:

        *result = hook_readlinkat(AT_FDCWD,

                                  reinterpret_cast<const char *>(arg0),

                                  reinterpret_cast<char *>(arg1),

                                  static_cast<int>(arg2));

        break;



    case SYS_readlinkat:

        *result = hook_readlinkat(static_cast<int>(arg0),

                                  reinterpret_cast<const char *>(arg1),

                                  reinterpret_cast<char *>(arg2),

                                  static_cast<int>(arg3));

        break;



    case SYS_fcntl:

        *result = hook_fcntl(static_cast<unsigned int>(arg0),

                             static_cast<unsigned int>(arg1),